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Nearby were two boats----they had come to the island.

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Nearby were two boats----they had come to the island.
A where B by which C in which D with which
He is absent,____is often the case.
A what B which C who D as
第一个题正确答案是C ,不太清楚B为什么不对.
第二个答案是D,和B有什么区别?
第一题:后面定语从句的大意是他们是搭这个船来的.船与乘客的关系是人坐在穿里面,用in.by也可用于交通工具,但做这种用法时,其后面应直接加名词单数,没用冠词以及任何形式的变化,如by bike.
第二题:as is often the case可以看作是一个固定短语,as在这里指代的是he is absent.如果用which的话,则为非限定性定语从句,非限定从中,which不能指代前面整个句子.
仅供参考哈.
第二题还不明白的话,建议翻一下语法书,找一下定语从句的用法.